Toán Lớp 8: phân tích đa thức thành nhân tử
1) x^2-16
2) 5x(3-2x)-7(2x-3)
3) x^3-4x^2+4x
4) x^2-y^2-2x+2y
5) x^2(x-1) +16 (1-x)
6) x^2 -25+y^2+xy
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Toán Lớp 8: phân tích đa thức thành nhân tử
1) x^2-16
2) 5x(3-2x)-7(2x-3)
3) x^3-4x^2+4x
4) x^2-y^2-2x+2y
5) x^2(x-1) +16 (1-x)
6) x^2 -25+y^2+xy
Comments ( 2 )
1) x^2-16
=x^2-4^2
=(x-4)(x+4)
2) 5x(3-2x) -7(2x-3)
=5x(3-2x) +7(3-2x)
=(3-2x)(5x+7)
4) x^2-y^2-2x+2y
=xy(x-y) -2(x-y)
(x-y)(xy-2)
5) x^2(x-1) +16(1-x)
=x^2(x-1) -16(x-1)
=(x-1) (x^2-16)
=(x-1) (x+4)(x-4)
6)x^2 -25+y^2+xy
=(x+y) ^2 -25
=(x+y+5)(x+y-5)